The pilot reported that, during landing in the tailwheel-equipped airplane and as the tailwheel touched down on the runway, the airplane suddenly veered to the right. The pilot attempted to correct with opposite rudder; however, the airplane veered hard to the left and exited the left side of the runway, despite the pilot’s use of right rudder and braking. The airplane subsequently nosed over and came to rest inverted. The airplane sustained substantial damage to the top left wing, vertical stabilizer, and rudder. A Federal Aviation Administration inspector reported that a postaccident examination of the airplane revealed no preaccident mechanical failures or malfunctions with the airplane that would have precluded normal operations. At the time of the accident, the pilot was landing on runway 28 with wind reported as variable 050 o to 290o with gusts to 20 knots.